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NFPA 85 : #PURGE CREDIT FOR COMBUSTION TURBINE & HRSG  

Question asked by ratnadeep.sinha on Sep 1, 2019

NFPA 85 : #PURGE CREDIT FOR COMBUSTION TURBINE & HRSG   

 

We have SGT 700 gas turbine followed by HRSG. HRSG is capable to run 100% firing mode also.

 

As per customer requirement while gas turbine trips, the HRSG (which is normally in un-fired mode) need to change over in fired mode of operation with duct burner within a short span of time. The main problem here is for purge cycle indicated in NFPA 85. However, it also defines Purge Credit, but validity of same is only for 8 days. Can some one explain what does the validity means, shall we have to trip the unit & purge to re-establish the purge credit.

 

Regards

 

Ratnadeep Sinha

India 

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